Can & may nothing is the same with every angel, as angels all have individual personalities. I have heard of folks keeping smaller fish such as neons with pairs of angels, usually they start out as juvie angels with neons, and the angels don't realize the size they have grown to, and what they are capable of. This is the best way, if you want to try it. Also, make sure the angels are well fed, the less they think about food, the less the chance the smaller fish will be looked at as food.
I have a pair I am reasonably sure that if I put in a few neons they wouldn't bother them. I have another pair that I am sure would eat them as soon as possible, especially the male. I've had to put background on the sides of that tank when any fry are in tanks next to it. He bashes himself stupid trying to get to them. Fish are very basic animals, with 2 things on their mind, food & reproduction. Some act on these instincts more than others, I have several koi that I really wish would start acting on the reproduction instinct already.
I'm not saying it won't work, sometimes it does, many times it doesn't. If you don't mind the possibility of losing some neons as feeders, give it a shot. Some people flip about loosing neons, others really don't care. I'd hate to say go for it, then that person tries it, and loses some fish they really like.